U.S. and Iraqi forces tightened security across Baghdad on Friday in advance of Sunday's expected guilty verdict against Saddam Hussein, while the Iraqi prime minister said he hoped the ousted leader will "get what he deserves."

Saddam has been on trial for murder and crimes against humanity and, if convicted, could be sentenced to death by hanging. A verdict is expected to set off further bloodshed.

"We hope that the verdict will give this man what he deserves for the crimes he committed against the Iraqi people," said Prime Minister Nouri al-Maliki, according to he AP. "The Iraqi people will express their happiness in a way they see fit and we will call on the Iraqi people through a broadcast statement to remain calm and express their happiness in an appropriate way in this current situation, in a way that does not risk their lives," the prime minister said after a meeting with tribal leaders from the southern city of Amarah.

An aide to al-Maliki said authorities are imposing a 12-hour curfew on Baghdad and three surrounding provinces starting at 6 a.m. Sunday. Not just cars, but people will be barred from the streets. Baghdad's airport also will be closed.